NilPortugues\Symfony\JsonApiBundle\DependencyInjection\Configuration::getConfigTreeBuilder PHP Метод

    public function getConfigTreeBuilder()
    {
        $treeBuilder = new TreeBuilder();
        $treeBuilder->root('nilportugues_json_api')->children()->arrayNode('mappings')->prototype('scalar')->isRequired()->cannotBeEmpty()->end();
        return $treeBuilder;
    }